Open AccessCopper-Palladium Core-Shell Bifunctional Nanoelectrocatalyst for Ethanol Oxidation and Hydrogen Evolution Reactions
Author(s) -
Bommireddy Naveen,
Rajendra Kumar Reddy Gajjala,
P. Suresh Kumar
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac6706
Subject(s) - tafel equation , bifunctional , palladium , catalysis , chemistry , electrochemistry , copper , inorganic chemistry , redox , hydrogen , chemical engineering , electrode , organic chemistry , engineering
Ethanol oxidation reaction (EOR) and hydrogen evolution reaction (HER) are two of the most important technical challenges during the manifestation of ethanol and H 2 -O 2 fuel cells. Herein we explore the electrocatalytic activity of copper- palladium core-shell nanostructures on pencil graphite (Cu@Pd/PGE) for EOR and HER. A maximum peak current density of 261±11 mA/cm 2 with excellent retention for 1000 potential cycling is observed for EOR. High-performance liquid chromatography and Raman analysis indicate upto 12-electron transfer oxidation with the formation of carbon dioxide or carbonate, which imply the superiority of the catalyst. High HER current near to its thermodynamic potential of ∼ 0 V vs. RHE, together with a stable performance for 1000 voltammetric cycles, make Cu@Pd/PGE as a potential catalyst for HER in acidic media. The catalytic efficiency is also manifested by the well resolved voltammetric features during HER activity with a Tafel slope comparable to commercial Pt/C catalysts. The excellent bifunctional activity of Cu@Pd/PGEprovides a new route for commercialisation of low-cost electrocatalysts for fuel cell applications.